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Listing 14-1 uses two techniques not directly related to web programming: Regex1 as a very simple and common active pattern for regular expression pattern matching. You learned about active patterns in 9. Our example is particularly interesting because it also shows how to use a parameterized active pattern. The value server as an asynchronous task. You learned about asynchronous tasks in 13. Many web servers handle multiple requests simultaneously, and highperformance web servers use asynchronous techniques extensively. In our example, the server task serves requests sequentially using a single thread, but we could just as well have started a dedicated thread for the server using more explicit threading techniques from System.Threading.
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Serving Dynamic Web Content with ASP.NET
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In practice, it is rare to develop and implement a web server manually as we did in the previous section. Instead, most web development adds an extension to an existing web server via a web development framework such as ASP.NET, PHP, or JavaServer Pages (JSP). In this section, we cover how F# can be used to write server-side applications using ASP.NET. ASP.NET is a fully compiled dynamic server technology that allows developers to write web applications as a set of dynamic pages and to describe how the pages should interact via a rich object model and an abundance of server-side controls. The resulting web applications are easy to deploy they are independent of the hosting environment and the system registry and can be configured through an integrated web application configuration tool or via XMLbased configuration files. ASP.NET was originally designed by Microsoft and is often used with Microsoft s Internet Information Services (IIS) web server but can also be used with Apache and others via the Mono implementation of ASP.NET and the CLI.
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Note Modern web development frameworks allow you to put together sophisticated websites with many useful features with almost no coding at all. Code is often used as glue between the incoming requests and back-end databases. For this reason, web programmers often need a variety of design, security, database, and system skills in addition to mastery of one or more programming languages. Some resources for these additional topics are discussed at http://www.expert-fsharp.com/Topics/WebDevelopment.
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ABOUT DYNAMIC PAGE-BASED WEB DEVELOPMENT FRAMEWORKS
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You may already be familiar with various web scripting languages and technologies that allow you to embed bits of code (usually in certain meta-tags or inside special markers) in your pages. When a request is made to such pages (which typically have a different file extension, such as .asp, .aspx, .php, .jsp, and so on), the web server invokes a preprocessor that consumes the page script and outputs the resulting HTML after evaluating each dynamic block. Depending on your web server architecture, such processors can be plugged in on demand (as with Apache s modules) or tied directly to the server technology (as with the Java-based web server Tomcat or as with ASP.NET).
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Roughly speaking, there are two main types of dynamic content generation. In the first, the scripting type, requests for the same scripted resource produce the same actions: the source page is pumped through the preprocessor every time, and each dynamic construct is distilled to HTML. Typically, this type of content generation is limited to using special tags and local code expressions that may refer only to a set of built-in features and occasionally a set of global state variables such as the server response. The problem with this approach is inherent: the dynamic functionality is often too limited, although it is simple to use. Most important, no caching or compilation is done, and as such it is much slower than the compiled alternatives. Furthermore, as dynamic functionality is added to a page, it becomes progressively more complex and more difficult to maintain, often leading to spaghetti code. Tying the dynamic content to the presentation layer in this way is well recognized as a significant drawback. The second approach is the one taken by ASP.NET and JSP. Here a page scripting model is combined with an underlying compiled language (Java for JSP, and any .NET language for ASP.NET) and the speed of serving static content. In this model, pages are composed of objects with complex life cycles and are generated/maintained by compiled programs, so a scripted page is translated to a program that generates the final HTML page and as a result can contain arbitrary logic expressed in the source language. These programs are produced on the fly and maintained by the web container. A change to a web page results in updating the server-side resource responsible for creating that web page. This compilation causes a one-time penalty, but subsequent requests will be served without any processing by simply sending the result of the new page-behind code.
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